Keller was hurt in the second quarter of Saturday's exhibition game at Houston. His leg bent unnaturally when he was tackled by D.J. Swearinger on an incompletion. He grabbed his right knee and was then carted off the field.

The good news for Keller is the source said the injury is not believed to be career-threatening and that he could be back to work next spring. Keller 28 will undergo an MRI on Sunday to confirm all of these initial fears.

Keller who spent the first four seasons of his career with the New York Jets signed a one-year $4.25 million deal with the Dolphins in the spring. The team offered him a four-year contract with roughly the same average per season (and more guaranteed money) but he decided to take the one-year contract in hopes of a bigger payday next offseason.

"Obviously I wanted to get a multi-year deal but I just didn’t feel like my worth was there and understandably so I missed half the year with injuries" Keller told Marvez and co-host Bill Polian on SiriusXM NFL Radio on Wednesday. "Miami is where I want to be it’s where I would like to be long-term for sure but I just want to take this season to kind of reestablish myself reprove myself and then kind of come back to the table and whether it’s a one-year deal whatever I’m comfortable here and this is for sure where I want to be."

Keller was injured after making a catch when he was hit low by Swearinger. The rookie safety offered Keller best wishes on his Twitter account (@JungleBoi_Swagg). Swearinger also wrote that the blow to Keller’s leg wasn’t designed to hurt him but he also wanted to avoid a hit to the head area that could draw an NFL fine.

“The rules say you can’t hit high so I went low and I’m sorry that happened” Swearinger told the Palm Beach Post after Houston’s 24-17 win. "I would think you’d rather have more concussions than leg injuries. Leg injury you can’t come back from that. A concussion you be back in a couple in a couple of weeks.”